SF6 Gas Recovery from SF6 / N2 Mixtures Using Polymer Membrane

Abstract

SF6 gas recovery is considered one of the most important issues when we utilize a gas mixture at a low SF6 content in gas insulation1). One of the plausible methods is to recover SF6 as liquid using the difference in boiling point between gas species in the mixture. However, it has been pointed out theoretically that the recovery loss by this method is very large when SF6 content in the mixture is lower than ~50 vol.%1). When gas mixtures with much lower SF6 contents are considered, the loss increases so much to make the liquefaction practically impossible.